Abstract

PEREZ MARTINEZ, David et al. THE PERFORMANCE OF CoMo/[1]-Al2O3 CATALYST MODIFIED WITH BORON AND POTASSIUM IN SIMULTANEUOUS REACTIONS OF OLEFINS HYDROGENATION AND 2-METHYLTHIOPHENE HYDRODESULFURIZATION. Rev.Colomb.Quim. [online]. 2008, vol.37, n.2, pp.219-231. ISSN 0120-2804.

The acid-base characteristics of the [1]-alumina support of sulfide CoMo catalysts were modified by boron (2, 3, 5, y 8% B2O3) and potassium (1, 3 y 5% K) addition. The catalysts were tested in simultaneous olefins (2,4,4-trimethyl-1-pentene y 2,4,4 trimethyl-2-pentene) hydrogenation (HYD) and 2-methyl-thiophene hydrodesulfurization (HDS) reactions, simulating the hydrotreating (HDT) of FCC (Fluidized Catalytic Cracking) naphtha. Results show that acid-base changes induced by B and K addition lead to an activity decrease in both HYD and HDS reactions, but, by contrast, an interesting increase in selectivity toward HDS over olefins HYD was also observed. These characteristics make these modified catalysts good candidates to be used in the naphtha HDT process. On the other hand, addition of B promotes cracking and methyl isomerization reactions, while, modification with K favors the double bond migration in branched olefins. The results of this work allow us to conclude that the activity and selectivity of CoMo/[1]-alumina catalysts for the HDS of FCC naphtha can be controlled by a proper modification of the acid-base properties of the alumina support by the addition of small quantities of B and K.

Keywords : CoMo catalyst; HYD; HDS; FCC naphtha.

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